Teleprinter transmitter for perforated tape records



AMay-l 19, '19353 u. yvUfsfrENsw l 2,639,323 .1

TELEPRINTER TRANSMITTER FOR PERRGRATED TAPE RECORDS Filed oct. 5, 195o [lilly A lve/@Z021 y iposed on the transmission shaft.

Patented May 19, 1953 UNITED "TEIJEPRINTER TRANSMITTER FOR PERFORATED'TAPE RECORDS Herbert 'Wstenen fKladow, "Ger-mamy, 'rossignol' tito -Siemens f& ilalske, Aktiengesellschaft, Siemeinestadt, near erlimiermany, a German corporation L12 Claims.

This Ainvention :is concerned with lteleprifnter transmitter lapparai'fus ,fprovided with perforated Whi'ohis -usuallya 'vfriotiontype Such a -driving arrangement putsioonsideiiablestresses on I'the gear Yvvlfieels'and results :in noisy operation aduring transmissionpauses, .i. ,-e., during Iperiods when the ftranmission of :signals interrupted.

The Tprincipal -object of ythe Yinvention ito avoid the above :indicated drawbaclss bydirec-tly coupling `or gearing with `the shaft -of `the drive .motor the ttransrnItter shaft which :carries cam :means -for lperio dical-ly-` actnatmgitransmitt'er oonztacts and 'by eshort-circuiting such fcontacts 4daring transmission pauses while the motor vis trunznmg.

The .direct coupling of the transmitter straft with `the motor eliminates the ,usual gear wheels tand clutch z-means, rtlzsis :avoiding :noisy v operation, reducing the'iload on -the -motor, #and therefore 'also reducing .the `motor rating. The invention, in addition, -si'rnplies the structural aspects :of the-it-ransrnitter.

.The above noted principal Lobject ofthe invenvtionis realized yin o afpreierred Vemlooolirnent 'by -utilizing lfor .the actuation iof the short-:circui-ting contacts `the means which isemployeid :for fadvancinr; 4the perforated l:tape record. This :means .may ybe :in the -for-rn "of `a `shiftinglevier which is put locking lposition Tonce during :each :revolultiornof vthe transmit-ter shaft, at the rconclusion of each .tape advance stroke, .a .control-camedia Theshifting lever may-oe held in this looking position, :depending on operating criteria which inlay require interruption of the transmission of signals, includ-- .in-g, fforiexarnple, the relativetensioning orslack- 4ening of the perforated `tape record vor 'the termination thereof, or :the 'stopping of the 'drive motor; or the vactuation of fthe Icurrent supply The above notedprincipalobjectiandfadditional l objects and features of the l invention will flee vdescribed. more in :detail with V.referente to y:the-ear:- oompanving drawings. fthese drawings,

yrepresenting :in simplified diagrammatic manner --essential lparts of Va transmitter ioraccomplis'hfing the-control'vof the :shifting lever in the man- `ner refer-red vto above; and

Eig. @illustrates :in similar diagrammatic manner :essentialistrnctural ,parts for'interrnpting the -ftran'sniission f in a 'twwvvay teleprinter oper-ation.

:Numeral -l designates the transmitter shaft which lis nirectlygeared for coupled with `the :shaft `lr6 of the .drive motor :35, ye. Y g., bvsuitable means shown in the form Kof -gearsst/l--ii8/39, to-give van example. The '-pivotally mounted shift lever fior :advancing the perforated tape-record 7l `is indicated at-3. iwinnerali3 .is a control -barvfor holdying the shift lever finloclied position toprevent advanoe'ofthe tape record "i, Ithereby interrupting the transmission of signals -Wllen such interruption-is'required. The transmittershaftcarries I a pluralityof camse. five cams, Aone such `cam being @indicated at 132 -eachcam being provided :for 'actuating transmitter contaot springs .such .as Yindicated at '3i The shaft alsocarries a control cam-:2 which puts the shift lever :3 in locking posivtion at the conclusionof each :advance stroke of the perforated tape reco-rd, thereby also :operatively vactuating the Contact springs vt2 which short-circuit the transmitter --contacts 3l. The generally Tes'liaped shift-levert carries on one Vof l'its warms the pawl which coacts with the Aratolfiet o provided --on the shaft carrying the sprocket-ii. `r-l`-he lattercoacts with the .perforated tape record l and shifts it by one step :responsive to each actuation of :the ratchet '-5 by the pavvl 4l. The leversorifeelerarms (not shown to .avoid extraneous details) coacting With-the taprecord w1 :are in suitable and known manner Valternately lifted :from and dropped upon the tape during the :advance thereof itofsense .the-markings onth-e tape Iinaccorda-nceWithknovnpractice.

The :control .par S :serves the .purpose of A free- "ing fthe shitting .means :for the .tape record, or

looking :it against opera-tion, :as may be required.

:,Aispring 9 is fprovidedffor biasing the control loar 7 3 nto :the 4right -in operating position, Vin which tlieshifting means, thatiis, the shift .lever -3 with :its `fpavvl-'li and angular extension 1H, is `,free to operate Vbecause the angular extension il is not impeded in its motion. AHowever, ii the control bar-is moved to the left, the-eary ill oarriedthereby Will be placed underneath the angular vextenfsion :Il -of the shift rlever 3 'and thus will 'lock it 'against :counterclockwise displacement, hold- `in'gu'ts jlower-end awayirom the'cam i :and vthere- .stopping vthe periodic advance of the :record :Figli shows .an aernbodimentioffthse i155 tape i. .It will be observed that ,the shift `lever 3 is locked With the pawl 4 in position of full advance of its operating stroke, thus positively locking the tape record 1 against further advance. The contact springs I2 are closed during this phase of the operation and short-circuit the transmitter contacts 3I. The transmission line is indicated at 40. The signal transmission under control of the tape record 1 is thus interrupted while the rotation of the transmitter shaft continues.

Current is supplied to the drive motor 35 over a suitable switch 4I which is connected with the switch arm I3 by the shaft 42. When this switch arm is placed into the off position, disconnecting current, its cam I4 will move the control bar 8 to the left, thus placing the ear IIJ underneath the angular extension I I of the shift lever 3 to hold the shift lever in locked position, into which it is moved at the conclusion of each advance stroke by the cam 2, as described before; but when the switch arm I3 is placed into the on position, in which it is shown, current will be supplied to the motor to start operation, and the control bar 8 will be free to move to the right, thus freeing the shift lever 3 for operative actuation by the cam 2. If desired, auxiliary contact means (not shown) may be actuated by the switch arm I3 to close at this moment a point in the transmitter or line circuit and to shortcircuit the manual transmitter means of the corresponding teleprinter apparatus.

The transmission of the signal impulses in accordance with the markings of the perforated tape record cannot begin until the drive motor has attained a predetermined speed of rotation. When this speed is attained, the centrifugal governor I5 carried by the motor shaft EE or by the motor armature causes displacement of an operating element, e. g., of the pin I1, to the left, as shown in the drawing, thus freeing the plvotally mounted lever I8 so as to permit displacement of the control bar 8 to the right under the pull of the spring 9. This operation takes place after partial angular clockwise displacement of the shift lever 3 under control of the cam 2. The shift lever 3 is freed for its full displacement by the removal of the ear I0 of the control bar 8 to the right, away from the angular extension I I of the shift lever. This operation is accomplished at the moment when the shift lever 3 is displaced clockwise into its terminal stroke position, being actuated into this position by the opera-tion of cam 2. The transmission of the signals therefore always begins with a full symbol signal impulse.

Increasing tension placed on the perforated tape record 1 carries the stirrup I9 to the left, and the latter presses on the control bar 8 by means of its bracket 33, to move the bar into its locking position with the ear Ill disposed underneath the angular extension II of the shift lever. If the tape record 'I slackens, the stirrup I9 will move to the right, and the control bar 8 follows at the moment when the angular extension II of the shift lever 3 is lifted consequent to clockwise displacement of the shift lever by the cam 2 at the conclusion of an advance stroke of the tape record. Special biasing means for the stirrup is not absolutely required but may be provided, if desired.

When the perforated tape record reaches its end, the lever arm 2D, which rests thereupon lightly by spring bias, will drop upon the pivotally mounted crank arm 2i through a slot in the tape guide (not shown), moving the crank arm clockwise to shift the control bar 8 to the left, thereby stopping the transmission by locking the shift lever 3 in terminal stroke position into which it has been placed by the cam 2. The lever arm 28 is preferably journalled in the bracket which holds the tape in its guide and is lifted with such bracket when a new tape record is inserted.

In order to avoid the transmission of distorted signals, incident to the slowing-down of the motor responsive to failure of the current supply for any cause, and to avoid the danger of stopping the transmitter with interrupted line circuit, there is provided a magnet 22 whose winding is connected in parallel with the motor circuit, thus keeping the magnet energized and the armature 23 normally attracted. If the current supply fails for any cause, the magnet 22 deenergizes, releasing the armature 23, and the latter is positioned incident to the next full stroke operation of the shift lever 3 underneath the angular extension I l in the same manner as the ear I0 of the control bar 8, to hold the shift lever locked against further operation.

The signal transmission may be interrupted, in a two-way operation, by the control means shown in Fig. 2, for the purpose of receiving signals from a remote station. On the transmitter shaftI I is for this purpose provided the cam 24 in which is formed a depression for the lever 25 which may fall into it `iust before the cam 2 (Fig. l) completes the clockwise stroke displacement of the shift lever 3. The lever 25 is normally held in inoperative position, against falling into the notch in the cam 24, by a magnet 25 whose winding may be disposed in the line circuit indicated at 45. In case the remote station should send signals While signal impulses are being transmitted in accordance with the perforated tape record 1, the line circuit will be interrupted and the magnet 26 will become deenergized. The lever 25 may now drop into the notch in the cam 24, moving thereby counter-clockwise and lifting the pawl 21 from engagement with a notch in the segment-shaped locking member shown at the right of Fig. 2. This locking member, which is mounted on the shaft 42 carrying the switch arm I3 (Fig. 1), is therefore permitted to move counter-clockwise under the pull of the spring 29 and places its portion 28 underneath the pawl 21. The switch arm i3 rotates with the locking member into the off position, in which current is disconnected, and the control bar 8 is moved into locking position to the left, as already described. The shift lever 3 is therefore held against operation, and the transmission under the control of the perforated tape record 'I is interrupted to permit receiving signals from the remote station.

Rotation of the switch i3, Fig. 1, manually into off position will also rotate the member 30 shown in Fig. 2, which is resiliently interlocked with the locking segment 28, and the upper edge of member 30 will lift the pawl 21 from the notch in member 28, thereby cancelling the interlock of the lever 25 with the switch shaft.

Changes may be made within the scope and spirit of `the appended claims.

I claim:

1. A perforated tape record signal transmitter of vthe class described comprising a drive motor, a transmitter shaft controlled by said drive motor, transmitter contacts, cam means on said transmitter shaft for periodically actuating said transmitter contacts, said transmitter shaft being directly coupled with the shaft of said drive motor, and contact means for short-circuiting said transmitter contacts to interrupt transmission under control of said perforated tape record while continuing operation of said drive motor.

with means forming a shift lever for periodically advancing said perforated tape record, cam means carried by said transmitter shaft for moving said' shift lever into locking position once during each revolution offsaid shaft, said shift lever control-` ling said contact means for short-circuiting said transmitter contacts, and means for holding said shift lever in locked position depending on predetermined operating criteria of said transmitter.

4. The transmitter defined in claim l, together.

with means yforming a shift lever for advancing:A said perforated tape record, cam means carried` by said transmitter shaft for moving said shi lever into locking position once during each' revolution of-s'aid shaft, a control bar for locking said shift lever in locking position, and meansy controlled by .said perforated tape record for actuating said control bar.

5. The transmitter defined in claim l, together with means forming a shift lever for advancing said perforated tape record, cam means carried by said transmitter shaft for moving said shift lever into locking position once during each revolution of said shaft, a, relay disposed in the motor circuit, said relay being normally energized, and means operated by said relay responsive to deenergization thereof for holding said shift lever inlocked position.

6. The transmitter defined in claim l, together with means forming a shift lever for advancing said perforated tape record, cam means carried by said transmitter shaft for moving said shift lever into locking position once during each rev'- olution of saidshaft, a control bar for locking said shaft lever in locking position, a main switch, and means operated by said main switch upon switching it to off position for actuating said contact bar :to hold said shift lever in locked position.

'7. A perforated tape record signal transmitter comprising aftransmitter shaft, a motor for opl erating said shaft, a shift lever, drive means loperated by said shift lever for advancing said perforated taperecord, cam means carried by said transmitter shaft for moving said shift lever into locking position once during each revolution of said shaft, means forming a control bar carrying an extension-,fo1' holding said shift lever in locked position, a main switch for said transmitter,V a stirrup for tensioning said tape record, a sensing lever coacting with said record, a speed governor for said motor, and means governed, respectively, (a) by said main switch in off position thereof;

(b) by said tensioning stirrup depending on the tension of said tape record; (c) by said sensing lever upon exhaustion of such record; and (d) by said speed governor upon slowing up of said motor, for actuating said control bar.

8. The transmitter defined in claim 7, together with means governed by interruption in the line circuit for actuating said control bar.

9. The transmitter defined in claim '7, together with a magnet having a winding disposed in the circuit of said motor, and an armature controlled by said magnet for coaction with said shift lever to hold said shift lever in locking position responsive to deenergization of said magnet.

10. The transmitter defined in claim 7, disposed in a circuit arranged for two-way operation, together with means for sensing current interruptions in the line circuit, means controlled by said sensing means for switching off said main switch to cause such switch to actuate said control bar to hold said shift lever in locked position.

11. In a perforated tape record transmitter of the class described which is disposed in a line circuit arranged for two-way signalling, a shift lever for periodically advancing said perforated tape record, an electromagnet having a winding disposed in said line circuit, a main switch, a control bar, means controlled by said electromagnet responsive to a predetermined current condition in said line circuit for actuating said main switch, and means operated by said main switch for actuating said control bar to lock said shift lever so as to stop the advance of said perforated tape record.

12. In a perforated tape record transmitter of the class described which is disposed in a line circuit arranged for two-way signalling operation, a shift lever for periodically advancing said perforated tape record, motor means for operating said shift lever, an electromagnet having a winding disposed in said line circuit, a main switch, a control bar, means controlled by said electromagnet responsive to a predetermined current condition in said line circuit for actuating said main switch to disconnect current from said motor, and means operated by said main switch in off position thereof for actuating said control bar to lock said shift lever so as to hold said perforated tape record in predetermined position of advance thereof.

HERBERT WSTENEY.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,921,079 Hamilton Aug. 8, 1933 1,965,121 Kardorft' 'July 3, 1934 1,980,284 Morton et al. Nov. 13, 1934 2,320,788 Mills et al June l, 1943 

